Final answer:
Refrigerator cookies are the classification of cookies that can be prepped ahead and quickly baked for unexpected guests, making them convenient for such situations.
Step-by-step explanation:
The classification of cookies that you can always have ready to bake if unexpected company arrives is A) Refrigerator cookies. Refrigerator cookies are a type of dough that is typically prepared in advance, shaped into logs or rolls, and then chilled in the refrigerator. When you need to bake them, you simply slice the chilled dough into individual cookies and bake them in the oven. This makes them very convenient for unexpected guests as the dough is already prepared, and you can bake as many as you need without any additional preparation time.